If you are considering repowering your wind turbines to take advantage of the PTC extension, we can tell you the projected life of your new gearboxes at a subcomponents level. Learn How: - The Importance of the Bill of Materials for your Individual Assets - How to avoid costly downtime and loss of revenue with your newly repowered machine - How to decide what gearbox and critical subcomponents to choose to optimize each asset - The impact each individual component has on the life and power output of your repowered asset View Webinar at: http://sentientscience.com/resource-library/videos/take-control-repowering-one-choose-whats-inside-machine/

1. © 2016 Sentient Science Corporation – Confidential & Proprietary
Take Control of Repowering
Choose What’s Inside Your Assets

2. © 2016 Sentient Science Corporation – Confidential & Proprietary
Repowering? What’s Next?
1. GEARBOX CONTROL 2. MANAGE TSA’S
3. MINIMIZE LOST PRODUCTION & MANAGE LIFE 4. LIFE EXTENSION – BEYOND PRO FORMA
Computationally test and understand the best GBX for each repowered asset. To protect yourself, obtain the Bill of Materials (BOM) and negotiate for serial
defect protection.
Continue power production and minimize O&M costs during the 12-14
timeframe before change-over.
Know the right actions to take to make your newly repowered machine last
beyond design life.
Take Control of Repowering - Choose What’s Inside Your Assets
REPOWERED
MACHINE
PRO FORMA
& BEYOND

3. © 2016 Sentient Science Corporation – Confidential & Proprietary
Repowering? What’s Next?
1. GEARBOX CONTROL
Computationally test and understand the best GBX for each repowered asset.
Take Control of Repowering - Choose What’s Inside Your Assets

4. © 2016 Sentient Science Corporation – Confidential & Proprietary
MAKE
MODEL
RATING
COUNTRY OF ORIGIN
DESIGN STANDARDS
METROLOGICAL
CHARACTERISTICS
LUBRICANTS
Gearbox Control
1. Compare gearbox OEM offerings
2. Understand the impact different
operating conditions will have on each
turbine
3. Obtain the data to negotiate what
gearbox is inside your machine
Take Control of Repowering - Choose What’s Inside Your Assets

5. © 2016 Sentient Science Corporation – Confidential & Proprietary
Case Study #1: DigitalClone® Live - Impact of Gearbox OEM Choice
GBX Supplier Differentiation and Selection
→ Operators take actions to reduce O&M cost
increase by evaluating new gearbox and
components life extension using DigitalClone
before procurement
→ DigitalClone® prognostic modeling applied to the
1.5 MW gearboxes to identify the best supplier
→ DigitalClone® predicted Supplier 3 gearbox is the
best due to relatively better bearings and gears
design and manufacturing processes
Supplier 1
Supplier 2
Supplier 3
Supplier 4
5 years 10 years 15 years 20 years
*Based on a 5 year history and 15 year forecast
Take Control of Repowering - Choose What’s Inside Your Assets

6. © 2016 Sentient Science Corporation – Confidential & Proprietary
2. MANAGE TSAs
Repowering? What’s Next?
To protect yourself, obtain the Bill of Materials (BOM) and negotiate for serial defect protection.
Take Control of Repowering - Choose What’s Inside Your Assets

7. © 2016 Sentient Science Corporation – Confidential & Proprietary
Managing Turbine Supply Agreements (TSA’s)
Repowering gives the Operator insight for better negotiations
 BOM Management:
1. Mandate as a condition of purchase the
BOM be provided at the subcomponent level
for drivetrain components
2. We have tools to fill in the gaps for missing
BOM components
3. If you want to have a BOM made for your
particular wind farm, we can assist with non
destructive investigation
 Serial Defect T&C’s:
1. 20% defect rate should be maximum
2. Agree to a joint funded 3rd party RCA
investigator
 OPC Tag List:
1. Transparency between OEM access and
owner access
2. Available API’s where OPC tags are protected
 Design Conditions:
1. Environmental design conditions
2. Electrical and mechanical fatigue are direct
results, largely influenced by the operating
conditions, which can be modeled
 Additional Documentation:
1. Drawings of internal components
2. Full maintenance documentation
Take Control of Repowering - Choose What’s Inside Your Assets

8. © 2016 Sentient Science Corporation – Confidential & Proprietary
Case Study #2: Identifying Serial Defects with DigitalClone
Importance of Collecting and Tracking Bill of Material for Fleet Planning
Sentient Science can help operators with borescoping and communication with component
suppliers to obtain correct bill of materials.
Take Control of Repowering - Choose What’s Inside Your Assets
Supplier Rollers Cage
Supplier A =/= 14 Narrow
Supplier B 14
Supplier C
=/= 14
Wide
Sentient Provides Best Practices to Identify Component Serial Number +
Supplier with Borescoping Borescope
New Data from SupplierOriginal Data from Operator
Sentient Helps Obtain Accurate BOM Data
Sentient works with suppliers and borescope inspection found significant differences in the expected bill of material from the operator and the real bill of material in the
turbines. The DigitalClone analysis led to hypothesis of failure for bull gears expected from poor material quality, higher stress from previous geometry, and material
handing issues for this batch. Based on the updated bill of material data and high risk of failure in the batch, 2 additional turbines were updated to high risk of premature
failure.

9. © 2016 Sentient Science Corporation – Confidential & Proprietary
3. MINIMIZE LOST PRODUCTION & LIFE
Repowering? What’s Next?
Continue power production and minimize O&M costs during the 12-14 month timeframe before
change-over.
Take Control of Repowering - Choose What’s Inside Your Assets

10. © 2016 Sentient Science Corporation – Confidential & Proprietary
Minimize Lost Production During Repower Change-over
1. 12-14 month timeframe between repower
change-over
2. Manage asset life during construction period
3. Reduce O&M investments
4. Consider life extension options during time-gap:
1. Smart Derate
2. Surface treatments
3. Fleet component Interchangeability
5. Use as “test bed”
Take Control of Repowering - Choose What’s Inside Your Assets

11. © 2016 Sentient Science Corporation – Confidential & Proprietary
Low Risk Opportunity to Pilot Potential Life Extension Innovations:
Take Control of Repowering - Choose What’s Inside Your Assets

12. © 2016 Sentient Science Corporation – Confidential & Proprietary
Case Study #3 – Using Physics Based Derate
Using System Models + Field Data from borescopes to manage gearing endurance limits specific to an asset
Take Control of Repowering - Choose What’s Inside Your Assets
• Main shaft bearing clearance was assumed to be 2.5mm.
• Based on the full gearbox analysis, it is recommended to derate the
turbine to 1.5MW to avoid Bull Gear teeth loss & surface damage.

13. © 2016 Sentient Science Corporation – Confidential & Proprietary
Case Study #4: DigitalClone® Live – Action Lists for Life Extension
Uptower and Derate Actions
→ Sentient provided Watch List and Life Extension
Action reports to customer during Dec. 2014
→ Long term and short term visibility to failure,
uptower repair was made during scheduled
maintenance activity, and zero unplanned downtime
was incurred.
→ Traditional data analytics did not detect this failure
Butterfly
Wings
Turbine ID
DigitalClone
Predicted MTOD
Damage Noticed
Date
Action Taken for
Life Extension
Life Extension,
Months
A Sept, 2015 Oct, 2015
Uptower
Replacement
33
B June, 2016 Aug, 2016 Derate 14
Take Control of Repowering - Choose What’s Inside Your Assets

14. © 2016 Sentient Science Corporation – Confidential & Proprietary
There are surface treatments, such as REWITEC®, that can
be added to the gearbox while it’s in operation and have
been shown to mitigate existing damage on components.
This could be a more cost effective solution compared to
replacing parts.
We’ve Created a Process for Customers to:
• Collect Borescope Reports from Damaged Turbines
• Classify the Damage Severity and Failure Mode of the
Borescope Images, and Compare These to the “Before”
Failure Mode and Severity in the Case Studies
• Make a Recommendation to our operators to consider
surface treatments to “freeze” the damage of these
components based on the case study
Case Study #5: Using Surface Treatments During Repowering Events
Evaluate Opportunities for Managing Component Damage
Take Control of Repowering - Choose What’s Inside Your Assets

15. © 2016 Sentient Science Corporation – Confidential & Proprietary
4. LIFE EXTENSION – BEYOND PRO FORMA
Repowering? What’s Next?
Understand the corrects actions to take to ensure your newly repowered machine last beyond
design life.
Take Control of Repowering - Choose What’s Inside Your Assets
REPOWERED
MACHINE
PRO FORMA
& BEYOND

16. © 2016 Sentient Science Corporation – Confidential & Proprietary
Operators and suppliers will know the earliest point in time when critical components will begin to fail and
have options to extend life
Extending the Life for Newly Repowered Machines
“Material Science Approach”
Take Control of Repowering - Choose What’s Inside Your Assets

17. © 2016 Sentient Science Corporation – Confidential & Proprietary
DigitalClone® Live – Site Analysis
Take Control of Repowering - Choose What’s Inside Your Assets

18. © 2016 Sentient Science Corporation – Confidential & Proprietary
Case Study #6: Life Extension Recommendations
List of
Recommended
Life Extension
Actions and
Option to
Confirm
Acceptance
Take Control of Repowering - Choose What’s Inside Your Assets
Financial
Reporting to
Connect O&M
Actions to
NPV/ROI of
Decision
Making

19. © 2016 Sentient Science Corporation – Confidential & Proprietary
Case Study #6: Life Extension Recommendations
Track Life
Extension
Actions Taken
and Track
Overall ROI of
Actions over
Time
Take Control of Repowering - Choose What’s Inside Your Assets

20. © 2016 Sentient Science Corporation – Confidential & Proprietary
Case Study #6: Financial Inputs
Financial Data Provided to Connect O&M to ROI Decisions
Financial Inputs
of Site Included
in Software
Take Control of Repowering - Choose What’s Inside Your Assets

21. © 2016 Sentient Science Corporation – Confidential & Proprietary
Repowering? What’s Next?
1. GEARBOX CONTROL 2. MANAGE TSA’S
3. MINIMIZE LOST PRODUCTION & MANAGE LIFE 4. LIFE EXTENSION – BEYOND PRO FORMA
Computationally test and understand the best GBX for each repowered asset. To protect yourself, obtain the Bill of Materials (BOM) and negotiate for serial
defect protection.
Continue power production and minimize O&M costs during the 12-14
timeframe before change-over.
Know the right actions to take to make your newly repowered machine last
beyond design life.
Take Control of Repowering - Choose What’s Inside Your Assets
REPOWERED
MACHINE
PRO FORMA
& BEYOND